Track-bound electric motor vehicle

Abstract

Disclosed is a driving arrangement for an electric motor vehicle in which each of the two wheels of an axle is supported on separate shaft sections. Each motor or each rotor of a dual rotor motor drives only one driving wheel of an axle in order to mechanically decouple the driving wheels. One of the separate shaft sections of the axles includes a tapered portion which forms a shaft stub and the other shaft section includes a hollow shaft stub. The tapered shaft stub is supported in the hollow shaft stub by a slide bearing disposed inside the hollow shaft stub. Speed differences at the slide bearing between the axle sections can result only from slippage when negotiating a turn or from uneven wear of, for example, the wheels.

What is claimed is: 
     
       1. In a track-bound motor vehicle including an axle having two wheels, electric motor means for driving each wheel and gearing for coupling the electric motor means to the wheels, the improvement comprising an axle having a separate shaft section coupled to each wheel, one of the shaft sections including a reduced dimension portion and the other of the shaft sections having a hollow portion which receives the reduced dimension portion of the one shaft section, bearing means for supporting the reduced dimension portion of the one shaft section in the hollow portion of the other shaft section, a hollow shaft surrounding each separate shaft section with clearance, one of the hollow shafts having a reduced dimension portion which is received in and supports the other of the hollow shafts, and an elastic coupling connected to each separate shaft section for elastically supporting the hollow shafts and coupling them to the separate shaft sections. 
     
     
       2. The improvement according to claim 1, wherein the gearing includes a gear fastened to each separate shaft section. 
     
     
       3. The improvement according to claim 1 and including means for elastically supporting parts of the axle relative to the wheels. 
     
     
       4. The improvement, according to claim 1, wherein the gearing includes a gear connected to each hollow shaft. 
     
     
       5. The improvement according to claim 2, 1, or 4 wherein the electric motor means comprises a double-rotor motor having a rotor coupled to a respective shaft section. 
     
     
       6. The improvement according to claim 5 and comprising nose suspension bearings for supporting the motor on the two shaft sections. 
     
     
       7. The improvement according to claim 1 or 4 for use in a two-axle drive in which the two axles are parallel and longitudinally spaced apart, wherein the motor means comprises two dual rotor motors interposed between the two axles, each of the motors being coupled to a shaft section of each of the two driving axles. 
     
     
       8. The improvement according to claim 7, wherein dual rotors of both motors are disposed in a common stator. 
     
     
       9. The improvement according to claim 7, wherein each dual rotor includes two rotor sections, one rotor section having a reduced dimension portion and the other rotor section having a hollow portion, the reduced dimension rotor portion being received and supported in the hollow portion of the other rotor section. 
     
     
       10. The improvement according to claim 1, wherein the bearing means between the reduced dimension shaft portion and the hollow shaft portion is a dry-lubricated slide bearing.